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Maths wonders

Right from playing abacus to solving any geometric rider, we just play with numbers in some methodical manner.
Maths is just the fun with numbers and exploration of different ways to solve any puzzle.
Yes but while playing ,there are some strict rules like ‘BEDMAS’ which we learn actually in 3rd - 4th standard.

The best reason for using conventional order of operations is the flexibility it gives you in writing down mathematical expressions. Remember that the operations of addition and multiplication are commutative, that is, they give you the same result no matter what order you write them in: 2*3 = 3*2. In conventional notation, that property is clearly reflected, and you get lots of options for how you want to write your expressions:

2*3+5 = 3*2+5 = 5+2*3 = 5+3*2 = 11. In calculator-order however, you only get the first two examples, 2*3+5 and 3*2+5, since in calculator-order notation the third example evaluates to 21, and the fourth evaluates to 16.